DE102019133567A1 - Cooling device and a battery system for a motor vehicle and a method for this - Google Patents

Abstract

The invention relates to a cooling device (16) for dissipating heat from a cooling object (18), comprising a cover plate (20) and a base plate (22), the respective inner sides (24, 26) of the plates (20, 22) having at least one Limit the cooling channel (32) through which cooling fluid can flow. For this purpose, the cover plate (20) is arranged on an outside (28) facing the surroundings (40) of the at least one cooling channel (32) on the cooling object (18) and on which facing an interior (34) of the at least one cooling channel (32) facing inside (26) at least partially joined to an inside (24) of the base plate (22) having a channel structure (36). Furthermore, the cooling device (16) comprises a stationary fluid braking element (42) which is arranged on an inside (24) of the base plate (22), whereby a cooling channel cross section of the at least one cooling channel (32) for selective braking of the cooling fluid is tapered.

Description

The invention relates to a cooling device for dissipating heat from a cooling object. The invention further comprises a battery system for a motor vehicle with such a cooling system and a method for providing the cooling device of this type.

It is generally known that in order to protect a heat-generating component from overheating, it is necessary to cool the component by means of a cooling device. The heat-generating component, d. H. a so-called cooling object to be cooled, for example an electrical energy storage device. As a battery cell, this battery module (with several battery cells) can be part of a battery system for a motor vehicle. The cooling device can have at least one cooling channel through which a cooling fluid can flow and which can be delimited by two metal sheets, wherein at least one of the metal sheets can have a channel structure, for example an elongated bulge for forming a channel. The cooling fluid can dissipate the heat from the component and, for example, release it to the surroundings of the component. In this context, cooling performance can be influenced by controlling a flow of cooling fluid.

For example, the describes for cooling at least one battery cell WO 2017/065762 A1 a plastic based cooling device. In this case, a metal-free cooling channel can be produced by means of an injection molding or an extrusion blow molding process and can comprise at least one control valve for controlling a fluid flow. It may be necessary here for the at least one control valve to be continuously adapted and maintained.

Another embodiment of a cooling device based on an aluminum alloy is described in US Pat CN 000109807247 A , whereby heat from a battery system is dissipated by means of a water-based cooling fluid. The cooling device can comprise two metal sheets, a cover sheet and a base sheet. To manufacture the cooling device, the pretreated base sheet can be joined to the cover sheet by means of hot rolling, the pretreated base sheet being able to have an insulating coating and a screen printing for specifying a cooling channel structure. A gaseous nitrogen at a pressure of 10 MPa (100 bar) can then be blown in through an opening in the cover plate for thermoplastic blow molding of the cooling channel of the base plate. A measure for controlling a cooling fluid flow is not provided in this cooling device.

The invention is based on the object of providing a uniform flow of cooling fluid in at least one cooling channel for cooling a cooling object.

The invention is based on the knowledge that a cooling device can comprise a multiplicity of flow channels. The flow channels currently each have the same cross section and flow channel lengths that differ from one another. As a result, the respective flow channels are flowed through differently by a cooling fluid and thus a cooling fluid flow has an imbalance, i.e. the cooling fluid flow is unbalanced.

The object is achieved by the subjects of the independent claims. Advantageous developments of the invention are described by the dependent claims, the following description and the figures.

The invention provides a cooling device of the type described at the outset, by means of which heat from a cooling object is to be dissipated. The cooling device according to the invention comprises a cover plate and a base plate, with respective inner sides of the plates delimiting at least one cooling channel through which a cooling fluid can flow, ie at least one flow channel. The insides of the sheets are therefore the mutually facing sides of the two sheets. The cover plate is arranged on the cooling object with an outside facing the surroundings of the at least one cooling channel and is at least partially joined to the inside of the base plate on the inside facing the inside of the at least one cooling channel. The inside of the base plate also has a channel structure. The two metal sheets of the cooling device can for example be formed from an aluminum material, a stainless steel material or a steel material. In order to reduce corrosion of the sheets, in particular in the area of the at least one cooling channel, the inside and / or the outside of the respective sheet can have corrosion protection, for example in the form of a coating (e.g. a conversion layer, an anodized layer or chromating) or a Coating (for example a synthetic resin, a plastic or a paint) can be applied. To form the at least one cooling channel, the two metal sheets are joined to one another, that is to say connected to one another, in particular on the respective inner side. For example, joining can take place by means of welding (eg laser welding), soldering, gluing, reshaping (eg riveting) or a combined joining process (eg gluing and riveting). The cooling object to be cooled can, for example, be an electrical energy store, which is a part of a battery cell or a battery module a battery system for an at least partially electrically drivable motor vehicle. The cooling fluid used for cooling can be based, for example, on a liquid (for example water, an oil or a water-glycol mixture) or on a gas (for example air, carbon dioxide).

According to the invention, a stationary fluid braking element is arranged on the inside of the base plate. The fluid brake element is thus positioned on the inside of the base plate in order to form a flow brake. The fluid braking element can be designed to be stationary, d. H. a position and / or a location of the fluid braking element always remain unchanged. For this purpose, the fluid braking element can be designed in one piece. For the selective braking of the cooling fluid, a cooling channel cross section of the at least one cooling channel is tapered. Thus, the cooling channel cross-section in the area of the fluid braking element is reduced by means of this fluid braking element, that is to say reduced in comparison to the upstream and downstream adjacent channel areas, that a cooling fluid flow can be controlled or adjusted in a targeted manner. For example, a flow rate, a pressure, a temperature or a flow ratio (e.g. turbulent or laminar) of the cooling fluid can be set. For example, the fluid braking element is an external component arranged, for example, when the cooling device is being manufactured, or a part of the channel structure of the base plate.

The invention has the advantage that the cooling fluid flow influenced by the fluid braking element can dissipate heat from the cooling object uniformly, i.e. in a balanced manner. A predetermined uniformity criterion can be met by the size and / or shape of the respective fluid braking element. As a result, a volume flow of the cooling fluid can be set in a targeted manner and the cooling device can be operated particularly efficiently. Furthermore, due to a stationary and one-piece design, the fluid brake element is very robust and less maintenance-intensive compared to a displaceable and multi-part fluid brake element (e.g. a valve).

The invention also includes embodiments which result in additional advantages.

An advantageous embodiment provides that a counter-element corresponding to the fluid braking element is positioned on the outside of the cover plate. Thus, the counter element is arranged as a counter holder depending on the fluid braking element on the outside of the cover plate. For example, the fluid braking element and the counter-element are arranged overlapping in such a way that both elements are intersected by a plane spanned by the cooling channel cross section, which plane is arranged normal to a flow direction of the cooling fluid. The counter-element is designed to limit an at least partially plastic and / or at least partially elastic deformation of the cover plate in the direction of the cooling object. In this context, the at least partially plastic deformation is to be understood as an irreversible change in shape of the cover sheet when a force acting on the cover sheet exceeds a flow limit, this change in shape being maintained after the force has ended. In the case of the at least partially elastic deformation, the cover plate is deformed due to the action of force, the cover plate returning to its original shape when the action of force ceases. The change in shape of the cover plate can thus be controlled in a targeted manner by the counter-element limiting the deformation, ie restricting it in a region of the counter-element. Thus, the counter-element prevents a so-called inflation effect of the cover plate in the area of the flow brake and holds the cover plate in the area of the flow brake in a form predetermined by the counter-element. As a result, a constriction caused by the fluid braking element, that is to say a tapering of the at least one cooling channel, can be held in one position, that is to say fixed. In connection with the deformation of the cover plate, the outer side of the cover plate is formed on the cooling object, at least in some areas, if a compressive stress on the at least one cooling channel is greater than a predetermined stress value. In this case, the outside of the deformed cover plate clings directly to the cooling object, at least in some areas. The prerequisite for this is that the specified stress value is exceeded by the compressive stress. Thus, an intermediate space between the cover plate and the cooling object is at least partially filled. This results in the advantage that an intermediate space between an outside of the cover plate and the cooling object can be completely filled, in particular in certain areas, and the use of a gap filler can be dispensed with. Production tolerances on the outside of the cover plate and the cooling object can thus be compensated for in a particularly simple manner, and direct contact between the cooling object to be cooled and the cover plate delimiting the at least one cooling channel can be provided in some areas. Furthermore, the function of the fluid brake element as a flow brake can be ensured because an undesired widening of the constriction can be prevented. The flow brake can also be used in particular when the balancing of the cooling fluid flow can be provided with difficulty or only inadequately geometrically by means of an alternative brake element. Alternatively or in addition, the counter-element can enclose the cooling device on both sides, that is to say on the outside of the cover plate and the outside of the base plate.

A further advantageous embodiment of this provides that the counter-element is designed as a separate component, designed as a structure of at least one of the two metal sheets and is alternatively or additionally provided by the cooling object. The counter-element can thus be provided as an independent component, that is to say external to the cooling device, and can comprise, for example, the same or a different material of the sheets (for example as a metal, a polymer, in particular an elastomer, a composite material or a hybrid material). For this purpose, the counter-element can be designed, for example, as part of an underrun protection. Thus, the counter-element can be designed variably, only a pressure resistance to limit the deformation of the cover plate is to be ensured. Alternatively or additionally, the counter-element can be designed as a structure of at least one of the two metal sheets and thus integrated into at least one of the two metal sheets. Thus, the counter-element is a part of the cover plate and / or the base plate, wherein the part can be implemented, for example, as a reinforcement arranged in regions on the respective outside of the at least one plate. In this way, the cooling device can be provided with a particularly compact design. Alternatively or additionally, the counter-element is part of the cooling object. For example, this can be a fastening element (a so-called sidebinder) of a battery module that fixes several battery cells, a body or structural element of the motor vehicle, a strut or a stiffening element. This results in the advantage that when the metal sheets and the at least one cooling channel are manufactured, a construction of the counter-element is not taken into account and can only be implemented at a later point in time.

A further advantageous embodiment provides that the at least one cooling channel has at least two main cooling channels arranged parallel to one another for the inflow and for the outflow of the cooling fluid. The at least one cooling channel thus comprises an inflow channel and an outflow channel, a parallelism characterizing a positional relationship of the at least two main cooling channels. The at least two main cooling channels are connected to one another by means of at least one secondary cooling channel, the at least one secondary cooling channel being arranged normal to the at least two main cooling channels. In particular, the at least one secondary cooling channel comprises a multiplicity of secondary cooling channels arranged parallel to one another. In this case, especially with a corresponding design of the flow brake implemented by means of the fluid brake element, a flow resistance can be increased and / or a pressure drop can be generated in order to provide a balancing of the cooling fluid flow between the parallel auxiliary cooling channels. When flowing through, the cooling fluid flows from the inflow channel via the at least one secondary cooling channel into the outflow channel. A longitudinal extension of the at least one secondary cooling channel describes a normal distance between the at least two parallel main cooling channels. Furthermore, the longitudinal extent of the secondary cooling duct is smaller than or equal to a respective longitudinal extent of the respective one of the at least two main cooling ducts. Thus, a longitudinal extension of the inflow channel and a longitudinal extension of the outlet channel are greater than the longitudinal extension of the at least one secondary cooling channel. In this way, a symmetrical and particularly uniform heat dissipation can be implemented using channel sections of the at least one cooling channel that are arranged normally and / or parallel to one another.

A further advantageous embodiment provides that, in a flow direction of the cooling fluid, the fluid braking element is arranged in front of an inflow region of the cooling fluid into an outflow channel. The fluid braking element is thus positioned upstream in front of the outflow channel, so that the cooling fluid flows over the fluid braking element to flow into the inflow area. In this case, an expression of the fluid braking element causing the taper is shaped as a function of a relative position within the cooling device. In this context, the expression describes in particular a geometric shape and / or a configuration of a surface of the fluid brake element, which influences the cooling channel cross-section and in particular its taper and a pressure drop resulting therefrom in a region of the fluid brake element, that is to say predetermines it. Thus, a position of the fluid brake element in relation to the cooling device specifies the expression of the fluid brake element. A relative distance between the fluid braking element and a flow source is particularly important here. The flow source can be an inflow opening for the cooling fluid into the cooling device, which is arranged, for example, on the base plate, and the relative distance describes a distance covered by the cooling fluid along respective sections of the at least one cooling channel. It can thus be ensured, for example, that a greater flow resistance is provided for a cooling duct in the vicinity of the flow source than for a further cooling duct which is at a greater distance from the flow source. This has the advantage that the respective flow resistance can be adjusted in a targeted manner and the heat from the cooling object can be dissipated particularly evenly.

A further advantageous embodiment provides that the base sheet has a base sheet thickness and the cover sheet has a cover sheet thickness that is less than or equal to the base sheet thickness. In this context, a respective sheet metal thickness describes a normal distance between the respective inside and the respective outside of the respective sheet. The base sheet thickness is between 0.5 mm and 1.0 mm and the cover sheet thickness is between 0.1 mm and 0.7 mm, in particular between 0.3 mm and 0.4 mm. This has the advantage that a base plate thickness increases the rigidity of the cooling device and, under certain circumstances, allows an underrun protection to be omitted. Furthermore, a deformation resistance of the cover sheet can be specified in a particularly simple manner on the basis of the cover sheet thickness. Alternatively or in addition, both sheets can in particular also have the same sheet thickness, so that the cover sheet and the base sheet can have at least one common production step (e.g. rolling, coating).

A further advantageous embodiment provides that a cross section of the fluid braking element is designed at least in sections as an arc of a circle and alternatively or additionally as a polygon. A shape of the fluid braking element thus dictates its cross section. The fluid braking element can have the shape of a sector of a circle, an associated part of a circular line forming the arc of a circle. Alternatively or additionally, the fluid braking element can be designed as a polygon, for example as a trapezoid or a triangle. This results in the advantage that, depending on the shape of the fluid braking element, a cross section of the at least one cooling channel and therefore a cooling fluid flow can be influenced in a particularly simple manner.

A further advantageous embodiment provides that the fluid braking element is designed as a separate component and, alternatively or additionally, is given by a shape of the base plate. Thus, the fluid braking element can be provided as an independent component, that is to say external from the cooling device, and can be manufactured, for example, from the same or a different material of the sheets (for example as a metal, a polymer, in particular an elastomer, a composite material or a hybrid material) . This results in the advantage that when the metal sheets and the at least one cooling channel are manufactured, the fluid braking element is not taken into account and can be installed at a later point in time, in particular when a requirement for the fluid braking element is known. Furthermore, the fluid braking element can also be provided, for example, by a component adjoining the outside of the base plate, for example by a floor plate or an underride guard. Alternatively or additionally, the fluid braking element can be designed as a structure of the base plate and thus be integrated into the base plate. The fluid braking element is thus part of the base plate and can be implemented, for example, as an elevation arranged in regions. In this way, the cooling device can be provided with a particularly compact design.

The invention also includes a battery system for a motor vehicle that comprises an embodiment of the cooling device according to the invention. The cooling object is designed as at least one electrical energy store of the motor vehicle, which is set up to supply the motor vehicle with electrical energy for at least partially electrical drive. The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or a truck, or as a passenger bus or a motorcycle. Furthermore, the motor vehicle can be an electric vehicle or a hybrid vehicle. As the at least one electrical energy store, the battery system can comprise a multiplicity of electrically interconnected battery cells, which are designed, for example, as prismatic cells or as pouch cells. Due to the electrical connection of the battery cells, such a battery system can provide an electrical voltage of more than 25 than 60 volts and in particular of several 100 volts, for example on the basis of several battery cells, which is why it is then also referred to as a high-voltage battery system.

The invention also includes further developments of the battery system according to the invention which have features as they have already been described in connection with the further developments of the cooling device according to the invention. For this reason, the corresponding developments of the battery system according to the invention are not described again here.

The invention also includes a method for providing an embodiment of the cooling device according to the invention. A cover plate and a base plate are provided for this purpose. To delimit at least one cooling channel through which a cooling fluid can flow by means of the two inner sides, the cover plate is arranged on an outer side facing the surroundings of the at least one cooling channel on the cooling object and on the inner side facing an interior of the at least one cooling channel at least partially with a channel structure Inside is joined. The method according to the invention is characterized in that a cooling channel cross section of the at least one cooling channel by means of a arranged on the inside of the base plate stationary fluid braking element is tapered, wherein the cooling fluid is selectively braked. This results in the advantage that a cooling fluid flow influenced by means of the fluid braking element can dissipate heat from the cooling object particularly uniformly, ie in a balanced manner, and the cooling device can be operated particularly efficiently.

A further advantageous embodiment of this provides that the cover plate is at least partially plastically and / or at least partially elastically deformed during production and alternatively or additionally when the cooling device is operated, with an overpressure for deforming the by means of a production fluid and alternatively or additionally the cooling fluid Cover plate in which at least one cooling channel is generated. Thus, a pressurized fluid, i. H. the production fluid and / or the cooling fluid, a pressure load on the at least one cooling channel, whereupon the cover plate can deform outwards, in particular in the direction of a cooling object arranged on the cover plate. Here, a respective overpressure can be, for example, 3 bar for the production fluid and between 0.5 and 1.5 bar for the cooling fluid. This results in the advantage that the overpressure during manufacture and / or operation of the cooling device can be set as a function of a desired degree of deformation. Alternatively or additionally, the deformation can also be carried out in several stages, so that in a first deformation step in the course of production, a basic deformation and in a second and final deformation step during operation, the outside of the cover plate can be molded onto the cooling object.

The invention also includes further developments of the method according to the invention which have features as they have already been described in connection with the further developments of the cooling device according to the invention. For this reason, the corresponding developments of the method according to the invention are not described again here.

The invention also includes the combinations of the features of the described embodiments.

• 1 eine schematische Darstellung eines Kraftfahrzeugs mit einer Kühlvorrichtung in einer Seitenansicht;
• 2 ausschnittsweise eine schematische Schnittdarstellung der Kühlvorrichtung in einer Ausführungsform;
• 3 ausschnittsweise eine schematische Schnittdarstellung der Kühlvorrichtung in einer weiteren Ausführungsform; und
• 4 eine schematische Perspektivdarstellung eines Grundblechs der Kühlvorrichtung.

Exemplary embodiments of the invention are described below. This shows:

• 1 a schematic representation of a motor vehicle with a cooling device in a side view;
• 2 a fragmentary schematic sectional illustration of the cooling device in one embodiment;
• 3rd a fragmentary schematic sectional illustration of the cooling device in a further embodiment; and
• 4th a schematic perspective illustration of a base plate of the cooling device.

The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention that are to be considered independently of one another and that each also develop the invention independently of one another. Therefore, the disclosure is intended to include combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention that have already been described.

In the figures, the same reference symbols denote functionally identical elements.

1 shows a schematic representation of a motor vehicle 10 . The car 10 can by means of a battery system 12th are at least partially driven electrically. This includes the battery system 12th at least one electrical energy store 14th , which can be designed as at least one battery cell. When supplying electricity to the motor vehicle 10 arises in the at least one electrical energy store 14th a waste heat generated by means of a cooling device 16 can be discharged. The at least one electrical energy store is thus involved 14th around a cooling object to be cooled 18th .

2 and 3rd show with reference to those related to 1 The components shown and described each detail a schematic sectional view of the cooling device 16 in a respective embodiment. The cooler 16 includes two sheets 20th , 22nd , ie a cover sheet 20th and a base plate 22nd that have a respective inside 24 , 26th and a respective outside 28 , 30th exhibit. The two insides 24 , 26th are for delimiting a cooling channel through which a cooling fluid, that is to say a cooling medium, can flow 32 at least partially joined to one another, ie connected so that the two inner sides 24 , 26th to an interior 34 of the cooling duct 32 are facing. Thus, the cooling channel 32 provide a cavity, ie a so-called flow channel for the cooling fluid. The inside points to this 26th of the base plate 22nd at least in some areas a channel structure 36 for the cooling duct 32 on. The cooling fluid flows through the cooling channel 32 along a direction of flow 38 in the x direction, which is indicated schematically by means of several directional arrows. Furthermore is the cover plate 20th at one to one Surroundings 40 of the cooling duct 32 turned outside 28 on the cooling object 18th arranged.

The cooling duct has for selective braking of the cooling fluid 32 one on the inside 26th of the base plate 22nd arranged fluid braking element 42 on. This creates a cooling channel cross section of the cooling channel 32 rejuvenates. Such a tapering of the cooling channel can be shown schematically 32 based on a respective channel diameter D1 , D2 of the cooling duct 32 be taken in the y-direction, with a channel diameter D1 the untapered channel cross section downstream of the fluid braking element 42 and a channel diameter D2 the tapered cooling channel cross-section in the area of the fluid braking element 42 characterized. Here, a geometric shape of the fluid braking element 42 influence a cooling fluid flow, with a cross section resulting from the geometric shape 44 can be designed differently. This shows 3rd one at least in sections as an arc of a circle 46 and 2 one at least in sections as a trapezoidal polygon 48 realized cross-section 44 of the fluid braking element 42 . For providing the fluid braking element 42 can the fluid braking element 42 by a shape of the base plate 22nd be given. An alternative or additional embodiment of the fluid braking element is not shown 42 as a separate component.

Furthermore, the cooling device comprises 16 on the outside 28 of the cover plate 20th one to the fluid braking element 42 correspondingly positioned counter element 50 . By means of the counter element 50 can be an at least partially plastic, ie irreversible, and alternatively or additionally at least partially elastic, ie reversible deformation of the cover plate 20th in the direction of the object to be cooled 18th be limited in the y-direction. The deformation of the cover plate can, for example, be based on a further channel diameter D3 of the cooling duct 32 be read of the deformed channel cross-section upstream in front of the fluid braking element 42 describes. Here is the outside 28 of the cover plate 20th at least in some areas directly on the cooling object 18th molded in case there is pressure on the cooling channel 32 is greater than a specified stress value. The compressive stress on the cooling duct 32 can be implemented in the form of an overpressure of the cooling fluid and alternatively or additionally a production fluid. In this case, the production fluid can be used during production of the cooling device 16 and alternatively or additionally the cooling fluid when the cooling device is operated 16 generate the overpressure. That means that a geometric shape of the cooling channel 32 is incomplete before a respective fluid is introduced and only when the cover plate is inflated 20th is expanded, that is, bent, to its final shape by means of the fluid. The counter-element 50 of the cooling object 18th , for example as a fixing fastener 52 of the at least one energy store 14th be provided to limit deformation. An alternative or additional configuration of the counter-element is not shown 50 as a separate component or as a structure of the cover sheet 20th .

The sectional views in 2 and 3rd can also be a cover sheet thickness B1 of the cover plate 20th and a base plate thickness B2 of the base plate 22nd can be removed. The base sheet thickness can be B2 less than or equal to the cover sheet thickness B1 be trained. For example, the base plate thickness B2 between 0.5 mm and 1.0 mm and the thickness of the cover sheet B1 between 0.1 mm and 0.7 mm, in particular between 0.3 mm and 0.4 mm.

4th shows with reference to those relating to 1 to 3rd Components shown and described are a schematic perspective view of the base plate 22nd the cooling device 16 and an enlarged view of a partial section of the base plate 22nd when operating the cooling device 16 . The cooling duct 32 includes, for example, two main cooling channels arranged parallel to one another 54 , 56 , ie an inflow channel 54 for the inflow of the cooling fluid and an outflow channel 56 for the outflow of the cooling fluid. The two parallel main cooling channels 54 , 56 are exemplary by means of a large number of auxiliary cooling channels 58 connected to each other, the auxiliary cooling ducts 58 normal to the two main cooling channels 54 , 56 are arranged. For the sake of clarity, there are only three of the auxiliary cooling channels 58 provided with a reference number in the partial section. It can have a longitudinal extension 60 of the inlet duct 54 and a longitudinal extension 62 of the outflow channel 56 greater than a longitudinal extension in the z-direction 64 the auxiliary cooling ducts 58 be in the x-direction. Thus, the cooling fluid flows from a flow source 66 upstream of the inflow duct 54 can be arranged through the inflow channel 54 in a respective one of the auxiliary cooling channels 58 along the direction of flow 38 . Each of the auxiliary cooling channels 58 points in front of an inflow area 68 into the outflow channel 56 the fluid braking element 42 on that the taper of the auxiliary cooling duct 58 conditionally. In this case, an expression of the fluid braking element that causes the taper can be used 42 from a relative position within the cooling device 16 and in particular a relative distance of the fluid braking element 42 to the flow source 66 shaped dependent and a pressure drop of the cooling fluid in a region of the fluid braking element 42 pretend.

For providing the cooling device 16 become the cover sheet 20th and the base plate 22nd in a first step S1 provided with the inside 26th of the base plate 22nd at least partially the channel structure 36 having. In a second step S2 is used to delimit the at least one cooling channel through which a cooling fluid can flow 32 becomes the cover sheet 20th at which to an interior 34 of the at least one cooling channel 32 turned inside 26th at least partially with a channel structure 36 exhibiting inside 24 is joined, the cover sheet 20th at the to the environment 40 of the at least one cooling channel 32 turned outside 28 on the cooling object 18th is arranged. In a further third step S3 becomes a cooling channel cross section of the at least one cooling channel 36 by means of the on the inside 26th of the base plate 22nd arranged stationary fluid braking element 42 tapered, the cooling fluid being selectively braked.

A previous version of the cooling device 16 , for example in connection with a Premium Platform Electric (PPE) vehicle from the VW Group, at least two sheets of metal 20th , 22nd , in particular aluminum sheets, with similar and in particular the same wall thicknesses, ie sheet thicknesses B1 , B2 , include. A large number of flow channels, ie the main cooling channels 54 , 56 and several auxiliary cooling channels 58 ) into the sheets 20th , 22nd be shaped, but these can all have the same channel cross-section but different channel lengths. This allows the individual channels (main cooling channels 54 , 56 , Auxiliary cooling ducts 58 ) are flowed through differently with cooling medium (cooling fluid) and cannot be balanced.

Overall, the examples show how fluid cooling (cooling device 16 ) with inflation function and partial positioning elements (fluid braking element 42 and counter element 50 ) can be provided.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2017/065762 A1 [0003]
• CN 000109807247 A [0004]

Claims (11)

Cooling device (16) for dissipating heat from a cooling object (18), comprising a cover plate (20) and a base plate (22), the respective inner sides (24, 26) of the plates (20, 22) having at least one cooling channel ( 32), the cover plate (20) being arranged on the outside (28) facing the surroundings (40) of the at least one cooling channel (32) on the cooling object (18) and on that facing an interior (34) of the at least one cooling channel (32) facing inside (26) is at least partially joined to an inside (24) of the base plate (22) having a channel structure (36), characterized in that a stationary fluid braking element (42) on the inside (24) of the base plate (22) ) and thereby a cooling channel cross section of the at least one cooling channel (32) is designed to be tapered for selective braking of the cooling fluid. Cooling device (16) after Claim 1 , wherein on the outside (28) of the cover plate (20) a counter element (50) corresponding to the fluid braking element (42) is positioned, which is configured to at least partially plastic and / or at least partially elastic deformation of the cover plate (20) in To limit the direction of the cooling object (18), the outside (28) of the cover plate (20) being formed directly on the cooling object (18), at least in some areas, when the at least one cooling channel (32) is subjected to a pressure load greater than a predetermined load value. Cooling device (16) after Claim 2 wherein the counter element (50) is designed as a separate component and / or designed as a structure of at least one of the two metal sheets (20, 22) and / or is provided by the cooling object (18). Cooling device (16) according to one of the preceding claims, wherein the at least one cooling channel (32) has at least two main cooling channels (54, 56) arranged parallel to one another for the inflow and outflow of the cooling fluid, the at least two main cooling channels (54, 56) by means of at least of a secondary cooling channel (58) are connected to one another, the at least one secondary cooling channel (58) being arranged normal to the at least two main cooling channels (54, 56), with a respective longitudinal extension (60, 62) of the respective of the at least two main cooling channels (54, 56) ) is greater than a longitudinal extension (64) of the at least one secondary cooling channel (58). Cooling device (16) according to one of the preceding claims, wherein in a flow direction (38) of the cooling fluid, the fluid braking element (42) is arranged in front of an inflow region (68) of the cooling fluid into an outflow channel (56), wherein an expression of the fluid braking element (56) which causes the tapering. 42) is shaped as a function of a relative position within the cooling device (16), in particular a relative distance between the fluid braking element (32) and a flow source (66), and prescribes a pressure drop in the cooling fluid in a region of the fluid braking element (32). Cooling device (16) according to one of the preceding claims, wherein the base sheet (22) has a base sheet thickness (B2) and the cover sheet (20) has a cover sheet thickness (B1) that is less than or equal to the base sheet thickness (B2), the base sheet thickness (B2) between 0.5 mm and 1.0 mm and the cover sheet thickness (B1) between 0.1 mm and 0.7 mm, in particular between 0.3 mm and 0.4 mm. Cooling device (16) according to one of the preceding claims, wherein a cross section (44) of the fluid braking element (32) is designed at least in sections as a circular arc (46) and / or as a polygon (48). Cooling device (16) according to one of the preceding claims, wherein the fluid braking element (32) is designed as a separate component and / or is given by a shape of the base plate (22). Battery system (12) for a motor vehicle (10), comprising a cooling device (16) according to one of the preceding claims, wherein a cooling object (18) is designed as at least one electrical energy store (14) of the motor vehicle (10), which is set up to to supply the motor vehicle (10) with electrical energy for at least partially electrical propulsion. Method for providing a cooling device (16) according to one of the Claims 1 to 8th , a cover plate (20) and a base plate (22) being provided, at least one cooling channel (32) through which a cooling fluid can flow is delimited by means of respective inner sides (24, 26) of the plates (20, 22), the cover plate (20 ) on an outer side (28) facing the surroundings (40) of the at least one cooling channel (32) on the cooling object (18) and at least on the inner side (26) facing an interior (34) of the at least one cooling channel (32) is partially joined to an inner side (24) having a channel structure (36), characterized in that a cooling channel cross section of the at least one cooling channel (32) is tapered by means of a stationary fluid braking element (32) arranged on the inner side (26) of the base plate (22) , wherein the cooling fluid is selectively braked. Procedure according to Claim 10 , the cover plate (20) during manufacture and / or during an operation of the cooling device (16) is at least partially plastically and / or at least partially elastically deformed, an overpressure for deformation being generated in the at least one cooling channel (32) by means of a production fluid and / or the cooling fluid.

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